Wall shelf



FIG. 1 shows a perspective view of the design for the wall shelf looking from the top thereof.

FIG. 2 shows an end elevation view looking from the left side of FIG. 1.

FIG. 3 shows a bottom plan view of the shelf; and,

FIG. 4 shows a rear elevation view shown from the rear of FIG. 1. 

We claim the ornamental design for a wall shelf, as shown and described. 